From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765442AbZAOTok (ORCPT ); Thu, 15 Jan 2009 14:44:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759031AbZAOTo3 (ORCPT ); Thu, 15 Jan 2009 14:44:29 -0500 Received: from mga09.intel.com ([134.134.136.24]:24924 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758465AbZAOTo1 convert rfc822-to-8bit (ORCPT ); Thu, 15 Jan 2009 14:44:27 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.37,272,1231142400"; d="scan'208";a="378812641" From: "Ma, Chinang" To: "Wilcox, Matthew R" , Gregory Haskins , Steven Rostedt CC: Matthew Wilcox , Andrew Morton , James Bottomley , "linux-kernel@vger.kernel.org" , "Tripathi, Sharad C" , "arjan@linux.intel.com" , "Kleen, Andi" , "Siddha, Suresh B" , "Chilukuri, Harita" , "Styner, Douglas W" , "Wang, Peter Xihong" , "Nueckel, Hubert" , "chris.mason@oracle.com" , "linux-scsi@vger.kernel.org" , Andrew Vasquez , Anirban Chakraborty Date: Thu, 15 Jan 2009 12:44:16 -0700 Subject: RE: Mainline kernel OLTP performance update Thread-Topic: Mainline kernel OLTP performance update Thread-Index: Acl3QP0Gjqc9hSu4QH6guhS6q/X0fwAAC7NwAAH+YKA= Message-ID: References: <20090114163557.11e097f2.akpm@linux-foundation.org> <20090115012147.GW29283@parisc-linux.org> <20090114180431.f4a96543.akpm@linux-foundation.org> <1232028766.5966.10.camel@localhost.localdomain> <20090115094442.b6394544.akpm@linux-foundation.org> <20090115180052.GG29283@parisc-linux.org> <1232043287.21980.65.camel@localhost.localdomain> <496F8421.3070703@novell.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Gregory. I will test the resched-ipi instrumentation patch with our OLTP if you can post the patch and some instructions. Thanks, -Chinang >-----Original Message----- >From: Wilcox, Matthew R >Sent: Thursday, January 15, 2009 10:47 AM >To: Gregory Haskins; Steven Rostedt >Cc: Matthew Wilcox; Andrew Morton; James Bottomley; Ma, Chinang; linux- >kernel@vger.kernel.org; Tripathi, Sharad C; arjan@linux.intel.com; Kleen, >Andi; Siddha, Suresh B; Chilukuri, Harita; Styner, Douglas W; Wang, Peter >Xihong; Nueckel, Hubert; chris.mason@oracle.com; linux-scsi@vger.kernel.org; >Andrew Vasquez; Anirban Chakraborty >Subject: RE: Mainline kernel OLTP performance update > >Gregory Haskins [mailto:ghaskins@novell.com] wrote: >> > On Thu, 2009-01-15 at 11:00 -0700, Matthew Wilcox wrote: >> >> So if the reschedule interrupt is happening twice as often, and the >> >> context switch rate is basically unchanged, I guess that means the >> >> scheduler is doing a lot more work to get approximately the same >> >> results. And that seems like a bad thing. >> >> I would be very interested in gathering some data in this area. One >> thing that pops to mind is to instrument the resched-ipi with >> ftrace_printk() and gather a trace of this system in action. I assume >> that I wouldn't have access to this OLTP suite, so I may need a >> volunteer to try this for me. I could put together an instrumentation >> patch for the testers convenience if they prefer. > >I don't know whether Novell have an arrangement with the Well-Known >Commercial Database and the Well-Known OLTP Benchmark to do runs like this. >Chinang is normally only too happy to build his own kernels with patches >from people who are interested in helping, so that's probably the best way >to do it. > >I'm leaving for LCA in an hour or so, so further responses from me to this >thread are unlikely ;-)